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TM 9-2815-220-24
CRANKSHAFT MAIN BEARINGS INSPECTION
0138 00
INSPECTION (Continued)
NOTE
To avoid interference with the starter driven gear shaft, it is necessary
to install lower number 7 tie rod from the right side of block. Care
should be taken so that tie rods extend equally on both sides of block.
7. Install fourteen tie rods (12).
a. Install seven washers plates (13) and slotted nuts (14) onto tie rods (12).
b. Push tie rods (12) with washer plates and nuts (14) through crankcase (5).
c. Install remaining seven washer plates (13) and slotted nuts (14) onto opposite end of tie
rods (12). Finger tighten only at this time.
13
12
14
13
CAUTION
The procedure for tightening main bearing cap nuts incorporates both torque
and stud stretch. The untorqued height of the studs must first be measured,
then the studs are torqued incrementally to a final value, and finally the
stretch of the stud is measured. Stud stretch is defined as the difference
between the untorqued height and the torqued height of the studs.
Any stud that exceeds the maximum stretch (0.024 inch, or
0.6096 mm) prior to obtaining the minimum torque (58 foot-pounds, or 79
Nm) must be replaced.
Any stud that reaches maximum torque (69 foot-pounds, or 94 Nm) prior to
obtaining minimum stretch (0.019 inch, or 0.4826 mm) must be replaced.
Do not disturb dial indicator setting or position used for checking stud stretch.
Incorrect stretch measurement will result if indicator setting is changed -
which could result in premature failure of engine parts.
WP 0138 00-6

 


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